CubeSat Design Validation by AnalysisWilliam VILLERS, CTO & Director of Engineering - TEN TECH LLC
Space Tech Expo 2017 Open Technical Forum May 23, 2017 - Pasadena, CA
Today’s Agenda
• Introductions– TEN TECH LLC Services & Solutions– MSC Software, MSC One & MSC Apex
• CubeSat Validation with MSC Apex– Mechanical Specifications– Finite Element Modeling & Analysis
• Closing Remarks– MSC Apex – Extension to MSC One
INTRODUCTIONSTEN TECH LLC & MSC Apex
TEN TECH LLC assists Aerospace & Defense companies in designing better, safer products faster and at a reduced cost
• Co-Founder, CTO & Director of TEN TECH LLC– Manage Technical Aspects of the Company– Project Management & Customer Relations– Analysis Team Management
• Seasoned Aerospace & Defense Professional– MSME & ABD Doctor of Engineering, MIT France– 25 years of Industry Experience in EU & US
• Engineering & Engineering Management• Eurocopter, Aerospatiale, EDS
William VILLERS
• Aerospace & Defense Design, Test & Analysis Consultants– ITAR-Registered Woman Owned Small Business– Cage Code Holder, Active DD-2345 DoD Certification– Offices in Los Angeles, CA and Billerica, MA
• Modeling & Simulation Subject Matter Experts– Rugged Electronics, RF & Microwave Components– Structural Dynamics, Shock & Vibration– Thermal Design & Electronics Cooling
TEN TECH LLC Services & Solutions
Expertise & Industry Distribution
MSC Software
• Worldwide Leader in Multi-discipline Simulation Software– One of the 10 Original Software Companies– Awarded the Original NASA Nastran Contract in 1965
• Vast Portfolio of Industry-Standard Solvers– Nastran, Adams, Marc, Sinda, Actran
• Redefining CAE Process with MSC Apex– World’s First Computational Parts Based CAE System– High-performance Meshers & Integrated Structural Solver
• Easy to Learn, Easy to Use– Achieve Proficiency in Hours vs. Weeks
• CAE-specific Direct Modeling & Meshing– Geometry Abstraction & Simplification– High-performance Mesher
• Integrated & Generative Solver– Incremental Solver Methods – Computational Parts & Assemblies
MSC Apex CAE Platform
• Analysis Results Stored at Part Level– Allows for Incremental Model Validation– Speeds Up Assembly Analysis
• Assembly of Results vs Results of Assembly– Speeds Up Design Changes Reanalysis
• Only Changes are Processed• Faster Matrix Reassembly
• Average 2.5x Faster than First Solve– Often 10x depending on the solution
Structural Analysis with Computational Parts
CubeSat Analysis with MSC ApexRequirements, Environments, Finite Element Analysis
• Cal-Poly SLO CubeSat Design Specification– Mechanical, Electrical, Operational Requirements– Protoflight & Acceptance Testing Requirements
• NASA Goddard Space Flight Center GSFC-STD-7000– General Environmental Verification Standard– Modal Survey, Structural Loads, Sine Vibration, Shock
CubeSat Standard Design & Qualification
• Direct Import of Native CAD Assembly– SolidWorks, CATIA, NX, Pro/E,…– Retention of Product Structure– Geometry, Positioning
• Feature Suppression & Abstraction– Removal of Small Feature– Direct Modeling Operations
CAD Geometry As Analysis Starting Point
• Automated TET & Brick Meshing– Detailed Modeling of Electronics
• Disjoint Meshes Connections– Nastran Glue Joint
• Semi-Automatic Fastener Connections– Rigids & Beams Combination– Recovery of Fastener Loads
Mesh Creation
Modal Survey
• Classic Modal Analysis– Rigid Body Modes– Constrained Modes– Range of Interest [0,2000Hz]
• Dynamics Characterization– Resonant Frequencies– Dominant Modes– Mass Participation Factors
• Acceleration Equivalence to Shock & Vibration– Conservative, First-pass Evaluation– Dependent on Modal Analysis– Shock Pulse using Harris Formula – Random with Miles’ Equation
Quasi-Static Acceleration Analysis
• Modal Analysis + Modal Response– Time & Frequency Domain– Modal Truncation & Residual Vectors– Modal & Structural Damping– Stress Stiffening & Inertia Relief
• Traditional Response Output– Transmissibility & Transfer Functions– Modal Contribution– Peak Stress, Displacements,
Accelerations, Forces
Dynamics Response
• NASA-STD-5020 & NASA TM-106943– Recovery of Fastener Forces– Joint Separation & Slippage– Combined Bolt Tension, Shear, Bending– Bolts Thread Shear
Bolted Joints Calculations
• “Steinberg” Approach to Fatigue– Based on FEA Board Deflection
Electronics Components Vibration Fatigue
Closing RemarksConclusions, Q&A
• Fast Design Validation with MSC Apex – Fast Model Creation from Native Geometry– Good Breath of Structural Analysis Solvers– Computational Parts Save A Lot of Time
• Scalable via MSC One Token System– Reuse of Apex Model for Downstream Applications– Nastran Random Vibration Fatigue– Sinda/Thermica Orbital Thermal Analysis– Actran Vibro-Acoustics Analysis
Conclusions
• Website: https://www.tentechllc.com
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